Using two computers one connection, not working

[arbor 0]

Please help, my friend and I are trying to use two computers on one connection, but the server always kicks one of us. I have heard this is an issue with the ports, but haven't found a fix, please help!

[rabble-rouser 3]

Quick google search for "arma 2 two clients one connection" produced this

https://www.google.com/webhp?sourceid=chrome-instant&ie=UTF-8#hl=en&output=search&sclient=psy-ab&q=arma%202%20two%20clients%20one%20connection&oq=&gs_l=&pbx=1&fp=10991cd641b7fff3&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&biw=1280&bih=671

which lead me to

http://forums.bistudio.com/showthread.php?125021-Two-computer-s-cannot-connect-to-one-server

[arbor 0]

That did not help, i tried what one person said.